Structural investigation of the alluaudite-like mixed-valence iron phosphate: Na1.25Mg1.10Fe1.90(PO4)3
| Autor: | M. Ben Amara, Jacques Darriet, Léopold Fournès, Mourad Hidouri, B. Lajmi, Alain Wattiaux |
|---|---|
| Přispěvatelé: | Laboratoire de Chimie Structurale des Matériaux, Département de Chimie, Faculté des Sciences de Monastir (FSM), Université de Monastir - University of Monastir (UM)-Université de Monastir - University of Monastir (UM), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB) |
| Rok vydání: | 2008 |
| Předmět: |
Materials science
Valence (chemistry) Mechanical Engineering Inorganic chemistry Metals and Alloys Space group Phosphate Magnetic measurements [CHIM.MATE]Chemical Sciences/Material chemistry Crystal structure 010402 general chemistry 010502 geochemistry & geophysics 01 natural sciences Magnetic susceptibility X-ray diffraction 0104 chemical sciences Crystallography Mechanics of Materials Mössbauer spectroscopy X-ray crystallography Materials Chemistry Alluaudite Iron phosphate 0105 earth and related environmental sciences Monoclinic crystal system |
| Zdroj: | Journal of Alloys and Compounds Journal of Alloys and Compounds, Elsevier, 2008, 450 (1-2), pp.301-305. ⟨10.1016/j.jallcom.2006.10.119⟩ |
| ISSN: | 0925-8388 |
| Popis: | A new mixed-valence iron phosphate Na 1.25 Mg 1.10 Fe 1.90 (PO 4 ) 3 has been synthesized as single crystals by a flux technique and its structure has been refined from X-ray data to a residual R 1 = 0.032. The compound crystallizes in the monoclinic space group C 2/ c with the parameters: a = 11.7831(3) A, b = 12.4740(3) A, c = 6.3761(2) A, β = 113.643(2)° and Z = 4. The structure belongs to the alluaudite structural type, and thus it obeys to the X(2)X(1)M(1)M(2) 2 (PO 4 ) 3 general formula. The X(2) and X(1) sites are occupied by sodium while the M(1) and M(2) sites feature a statistical distribution of iron and magnesium. Additional information about the cation distribution has been extracted from a Mossbauer spectroscopy study which confirmed the mixed valency of the compound. A magnetic susceptibility study has also been undertaken and has shown the compound to be antiferromagnetic with a Neel temperature of about 35 K. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect